The answer to this question is self-explanatory, you may say. Tiles are designed to stay put. And drummy tiles are in effect loose tiles. So, if you don’t take immediate actions to do the appropriate tile repairs, the affected tiles may crack, lift or buckle. The movement forces, which take place in a tiling system, may cause the adjacent tiles of drummy tiles to “tent” or the loose tiles to “lip” when the flooring has been installed poorly. There have been even cases of tiles “exploding”, due to pressure forces, if the appropriate control of tile movement has not been applied during installation. Add incorrect adhesive-related procedures to the above and you’ll end up with a compromised tile floor sooner or later.